Fastening mechanism



Dec. 2, 1930. L. MGNAMARA 1,783,253

FASTENING MECHANISM l Filed March l2, 1928 LEON /V/c /VA/YIARA Patented Dec. 2, 1930 f UNITED STATES EPTEN LEON MCNAMARA, or RQCHELLE, lrLnINoIs FAsTnNrNe ME'cHANfIsM A My invention relates broadly to a latch mechanism and more particularly to a window fastening means. Y'

An object of my invention is to provide a means whereby a window may be securely` fastened in either a closed or a partially opened position.

Another object of my invention is the prcvision of a device thatwill permit a window V1o to be partially opened for the circulation of 25 Fig. l,

Figure 3 is a detail fragmentary view`V showing my invention in a locked position on a closed window,

F lgure 4 1s a view on the line 4-4 of Fig.

3, and

Figure 5 is a fragmentary view of a portion of the latch Varmvof my invention.

Referring more particularly to the drawings, my invention consists of two parts, one

of which, designated in its entirety by the numeral 5, is attached to the upper sashA of a window, and the other, 6, is attached to the lower sash B, and the'v two parts are so arranged on the respective sashes that they ``40 will be in horizontal alignment when Athe sashes are closed, as shown in Fig. 4.

y The part 5 is composed of three members, a base or support 7, a pivoted latch arm 8, and a pin 9 connecting the base and latch 545 arm and providing the pivot for the latter.

The base member may be of any desired construction but of sufficient height that an opening provided therethrough for the reception of the pin will permit the latch arm to move 1,50 freely Without coming into contact with the window sash.V Suitable fastening elements lOvtirinl'ysecure the base to the sash. The 'latch arm member 8 is provided Awith a substantially longitudinally extending slot ll "thati'sslightlyoffset at one. end, as at 1.2,"a'n'd` that "terminates al pocket 13, more clearly shown in "Fig 5, `thepu1pose ofwhich'will 'f be-jinoi-e `fully explained hereinafter. y The other =end ofthe vslotterminatesin :an enlarged nopening', 14. Tliejpin Q that"`connects the latch arm'rtgo'jthe base is fastened securely ft the armV at a' point slightly ,offset from the vertical center line [of the latch arm andis in vertical alignment jwith they poclreti'above referred to. ilitiisffreely rotatable s'lidable within* the openingiv through the I base V"member and is Aprevented from becoming detachedfro'm the base duri-ng itsjniovement'by "an'enlarged shoulder 1 5. The part 6, is'secured to`tlie'other-sashby` any suitable means 16 and is provided witlr'a stud lrextendingfrom approximately its centerpoint towards the latch arm, which lstud is pr'oyided with a collar 1'8. The collar i is of such size'jthat itwill passA freely through the 'enlarged opening A14 but willfbe retained v in the slot ll and pocket 13,forp`urposes -tobe *later explained'. v

' "As'above stated my invention is designed to provide an'efective window fastener when the windowis infeither aclosed or apartially opened position. The method of accomplishing this purposewillnow be explained.

'jWhen the lwindowis in'aIclosed positiofrrthe two sashes areinthe` position illustrated in Fig. 4, the `part 6, being so'arranged with 'respect to the part '5 that Lthe 'stud 17 lies "in 'vertical alignmentlwith the pin 9, the latch arm 8 iwilli'engage with the studi lwhen it is turned to ahorizontal position, as `shown in latch, arm, a cam oreccentric 1action is imparted' tothe larml in its turning movement, thus vproducing apressure ont the stud. `The armin its engagement'with thestud is seated` "betweenthe body ofthe part 6 and thejcollar V18 on the studiI Inthemanufacture of the various parts `consideration should be given to. the `various relativev dimensions' so "that proper engagementtof the .latch arm with the stud will be effected. If proper dimensions are provided, neither the upper sash can be lowered nor the lower sash raised When the parts are in the position just described. Vvvhen it is desired to partially open the window for ventilation, as for instance during sleeping hours, the same parts will furnish an effective fastener 'for the Window while so opened, permitting undisturbed repose of the occupant of the room as he may retire free in mind that the window cannot be opened from without except by breaking or removing the glass to free the fastening mechanism. To so posit-ion and latch the sashes together, the latch arm is removed from its horizontal fastening position to a Vertical position, whichl frees the arm from the collar 18 allowing the arm 8 to be moved towards its base member to the position shown in Fig. 4. The lower sash is then raised to the point where the stud registers with the enlarged opening 14 whereupon the latch arm is again moved from the base member to the position shown in Fig. 2. During the continued raising Aof the lower sash the stud rides along the slot 11 until it finally lodges in the pocket 13, which being, as pre?- viously described, in vertical alignment with the pin 9, prevents accidental movement of the ar1n8 away from its Vertical position. As the shoulder on the stud is larger in diameter than the slot is wide, these parts can be separated only at the enlarged opening, which requires that the sashes be brought into an approximately closed position. It will thus be seen that although the Window is open an effective fastener is provided. It will further be seen that my fastening mechanism permits the window to be opened at the top, at the bottom, or both top and bottom and yet maintain the desired safeguard. The disl tance to'which the window may be opened is limited only by the length of the slot in the latch arm, which should not be so great that sufficient space is allowed through "which an unauthorized .person might crawl.

AIt will be understood that the above description and accompanying drawings com- Jprehend `only the general and preferred embodiment -of my invention and that various minor changes in details ofconstruction, proportion and .arrangement .of parts may be made Within thescope of the appended claim ,and Without sacriicinganyof the advantages of my invention.

Having described V`my invention, what I claim as new is:

In a fastening mechanism comprising in combi-natioma base member attached to a Vslidable section, an arm .pivotally carried by ment with the pivot point of the arm, and the other end terminating in an enlarged opening, a second member attached to an adjacent slidable section, and a stud carried thereby engageable by the arm in one of its positions and seatable in the pocket in another of its positions.

LEON MCNAMARA. 

